Systems, methods, apparatuses, and computer program products directed to next generation (e.g., 5G systems) key set identifier(s) are provided. One method includes requesting, by a network node, authentication of a user equipment with an authentication server, receiving a master key and authentication parameters/vectors from the authentication server when authorization is successful, and verifying validity of the authentication request. When the verification is successful, the method may further include instantiating a security context for the user equipment and assigning a security context identifier for next generation system security context to the user equipment, and then sending a security mode command message to instruct the user equipment to instantiate security context using the security context identifier.